Interesting thread.

HEL/CPH/OSL/BRU/HAM/DUS/MUC/RIX: free to roam, remember Visa requirements concerning Schengen though.

TXL: all lounges (and just about everything else too) are landside.

ARN: different terminals, but I have succeeded in accessing Terminal 5 when flying out of Terminal 2 even though the transfer includes a landside bus.

FRA seems to be on the "disconnected" list. However, I 've been able to access the E gate area in Terminal 2 while flying out of Terminal 1. Maybe I was just lucky.